model.asc iasp91 velocity model 
remark: 1:Corad discon.; 2: Moho discon.
no   top-depth  Vp(km/s)  Vs(km/s)   remark
1     0        5.00        2.89      0
2     18       6.50        3.76      1
3     33       8.00        4.62      2
4     71       8.0442      4.4827    0